ceph/src/boost/libs/spirit/include/boost/spirit/home/karma/numeric/real.hpp

   1 //  Copyright (c) 2001-2011 Hartmut Kaiser
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 #if !defined(BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM)
   7 #define BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM
   8
   9 #if defined(_MSC_VER)
  10 #pragma once
  11 #endif
  12
  13 #include <boost/config/no_tr1/cmath.hpp>
  14 #include <boost/config.hpp>
  15 #include <boost/mpl/bool.hpp>
  16 #include <boost/utility/enable_if.hpp>
  17 #include <boost/spirit/home/support/common_terminals.hpp>
  18 #include <boost/spirit/home/support/string_traits.hpp>
  19 #include <boost/spirit/home/support/numeric_traits.hpp>
  20 #include <boost/spirit/home/support/info.hpp>
  21 #include <boost/spirit/home/support/char_class.hpp>
  22 #include <boost/spirit/home/support/container.hpp>
  23 #include <boost/spirit/home/support/detail/get_encoding.hpp>
  24 #include <boost/spirit/home/karma/meta_compiler.hpp>
  25 #include <boost/spirit/home/karma/char.hpp>
  26 #include <boost/spirit/home/karma/delimit_out.hpp>
  27 #include <boost/spirit/home/karma/auxiliary/lazy.hpp>
  28 #include <boost/spirit/home/karma/detail/get_casetag.hpp>
  29 #include <boost/spirit/home/karma/detail/extract_from.hpp>
  30 #include <boost/spirit/home/karma/detail/enable_lit.hpp>
  31 #include <boost/spirit/home/karma/domain.hpp>
  32 #include <boost/spirit/home/karma/numeric/real_policies.hpp>
  33 #include <boost/spirit/home/karma/numeric/detail/real_utils.hpp>
  34 #include <boost/fusion/include/at.hpp>
  35 #include <boost/fusion/include/value_at.hpp>
  36 #include <boost/fusion/include/vector.hpp>
  37
  38 namespace boost { namespace spirit
  39 {
  40     namespace karma
  41     {
  42         ///////////////////////////////////////////////////////////////////////
  43         // forward declaration only
  44         template <typename T>
  45         struct real_policies;
  46
  47         ///////////////////////////////////////////////////////////////////////
  48         // This is the class that the user can instantiate directly in
  49         // order to create a customized real generator
  50         template <typename T = double, typename Policies = real_policies<T> >
  51         struct real_generator
  52           : spirit::terminal<tag::stateful_tag<Policies, tag::double_, T> >
  53         {
  54             typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
  55
  56             real_generator() {}
  57             real_generator(Policies const& p)
  58               : spirit::terminal<tag_type>(p) {}
  59         };
  60     }
  61
  62     ///////////////////////////////////////////////////////////////////////////
  63     // Enablers
  64     ///////////////////////////////////////////////////////////////////////////
  65     template <>
  66     struct use_terminal<karma::domain, tag::float_>       // enables float_
  67       : mpl::true_ {};
  68
  69     template <>
  70     struct use_terminal<karma::domain, tag::double_>      // enables double_
  71       : mpl::true_ {};
  72
  73     template <>
  74     struct use_terminal<karma::domain, tag::long_double>  // enables long_double
  75       : mpl::true_ {};
  76
  77     ///////////////////////////////////////////////////////////////////////////
  78     template <>
  79     struct use_terminal<karma::domain, float>             // enables lit(1.0f)
  80       : mpl::true_ {};
  81
  82     template <>
  83     struct use_terminal<karma::domain, double>            // enables lit(1.0)
  84       : mpl::true_ {};
  85
  86     template <>
  87     struct use_terminal<karma::domain, long double>       // enables lit(1.0l)
  88       : mpl::true_ {};
  89
  90     ///////////////////////////////////////////////////////////////////////////
  91     template <typename A0>
  92     struct use_terminal<karma::domain                   // enables float_(...)
  93       , terminal_ex<tag::float_, fusion::vector1<A0> >
  94     > : mpl::true_ {};
  95
  96     template <typename A0>
  97     struct use_terminal<karma::domain                   // enables double_(...)
  98       , terminal_ex<tag::double_, fusion::vector1<A0> >
  99     > : mpl::true_ {};
 100
 101     template <typename A0>
 102     struct use_terminal<karma::domain                   // enables long_double(...)
 103       , terminal_ex<tag::long_double, fusion::vector1<A0> >
 104     > : mpl::true_ {};
 105
 106     // lazy float_(...), double_(...), long_double(...)
 107     template <>
 108     struct use_lazy_terminal<karma::domain, tag::float_, 1>
 109       : mpl::true_ {};
 110
 111     template <>
 112     struct use_lazy_terminal<karma::domain, tag::double_, 1>
 113       : mpl::true_ {};
 114
 115     template <>
 116     struct use_lazy_terminal<karma::domain, tag::long_double, 1>
 117       : mpl::true_ {};
 118
 119     ///////////////////////////////////////////////////////////////////////////
 120     // enables custom real generator
 121     template <typename T, typename Policies>
 122     struct use_terminal<karma::domain
 123           , tag::stateful_tag<Policies, tag::double_, T> >
 124       : mpl::true_ {};
 125
 126     template <typename T, typename Policies, typename A0>
 127     struct use_terminal<karma::domain
 128           , terminal_ex<tag::stateful_tag<Policies, tag::double_, T>
 129           , fusion::vector1<A0> > >
 130       : mpl::true_ {};
 131
 132     // enables *lazy* custom real generator
 133     template <typename T, typename Policies>
 134     struct use_lazy_terminal<
 135         karma::domain
 136       , tag::stateful_tag<Policies, tag::double_, T>
 137       , 1 // arity
 138     > : mpl::true_ {};
 139
 140     // enables lit(double)
 141     template <typename A0>
 142     struct use_terminal<karma::domain
 143           , terminal_ex<tag::lit, fusion::vector1<A0> >
 144           , typename enable_if<traits::is_real<A0> >::type>
 145       : mpl::true_ {};
 146 }}
 147
 148 ///////////////////////////////////////////////////////////////////////////////
 149 namespace boost { namespace spirit { namespace karma
 150 {
 151 #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
 152     using spirit::float_;
 153     using spirit::double_;
 154     using spirit::long_double;
 155 #endif
 156
 157     using spirit::float_type;
 158     using spirit::double_type;
 159     using spirit::long_double_type;
 160
 161     ///////////////////////////////////////////////////////////////////////////
 162     //  This specialization is used for real generators not having a direct
 163     //  initializer: float_, double_ etc. These generators must be used in
 164     //  conjunction with an attribute.
 165     ///////////////////////////////////////////////////////////////////////////
 166     template <
 167         typename T, typename Policies, typename CharEncoding, typename Tag>
 168     struct any_real_generator
 169       : primitive_generator<any_real_generator<T, Policies, CharEncoding, Tag> >
 170     {
 171         typedef typename Policies::properties properties;
 172
 173         template <typename Context, typename Unused>
 174         struct attribute
 175         {
 176             typedef T type;
 177         };
 178
 179         any_real_generator(Policies const& policies = Policies())
 180           : p_(policies) {}
 181
 182         // double_/float_/etc. has an attached attribute
 183         template <typename OutputIterator, typename Context, typename Delimiter
 184           , typename Attribute>
 185         bool generate(OutputIterator& sink, Context& context
 186           , Delimiter const& d, Attribute const& attr) const
 187         {
 188             if (!traits::has_optional_value(attr))
 189                 return false;       // fail if it's an uninitialized optional
 190
 191             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
 192             return inserter_type::call(sink, traits::extract_from<T>(attr, context), p_) &&
 193                    karma::delimit_out(sink, d);    // always do post-delimiting
 194         }
 195
 196         // this double_/float_/etc. has no attribute attached, it needs to have
 197         // been initialized from a direct literal
 198         template <typename OutputIterator, typename Context, typename Delimiter>
 199         static bool generate(OutputIterator&, Context&, Delimiter const&
 200           , unused_type)
 201         {
 202             // It is not possible (doesn't make sense) to use numeric generators
 203             // without providing any attribute, as the generator doesn't 'know'
 204             // what to output. The following assertion fires if this situation
 205             // is detected in your code.
 206             BOOST_SPIRIT_ASSERT_FAIL(OutputIterator, real_not_usable_without_attribute, ());
 207             return false;
 208         }
 209
 210         template <typename Context>
 211         static info what(Context const& /*context*/)
 212         {
 213             return info("real");
 214         }
 215
 216         Policies p_;
 217     };
 218
 219     ///////////////////////////////////////////////////////////////////////////
 220     //  This specialization is used for real generators having a direct
 221     //  initializer: float_(10.), double_(20.) etc.
 222     ///////////////////////////////////////////////////////////////////////////
 223     template <
 224         typename T, typename Policies, typename CharEncoding, typename Tag
 225       , bool no_attribute>
 226     struct literal_real_generator
 227       : primitive_generator<literal_real_generator<T, Policies, CharEncoding
 228           , Tag, no_attribute> >
 229     {
 230         typedef typename Policies::properties properties;
 231
 232         template <typename Context, typename Unused = unused_type>
 233         struct attribute
 234           : mpl::if_c<no_attribute, unused_type, T>
 235         {};
 236
 237         literal_real_generator(typename add_const<T>::type n
 238               , Policies const& policies = Policies())
 239           : n_(n), p_(policies) {}
 240
 241         // A double_(1.0) which additionally has an associated attribute emits
 242         // its immediate literal only if it matches the attribute, otherwise
 243         // it fails.
 244         template <typename OutputIterator, typename Context, typename Delimiter
 245           , typename Attribute>
 246         bool generate(OutputIterator& sink, Context& context
 247           , Delimiter const& d, Attribute const& attr) const
 248         {
 249             typedef typename attribute<Context>::type attribute_type;
 250             if (!traits::has_optional_value(attr) ||
 251                 n_ != traits::extract_from<attribute_type>(attr, context))
 252             {
 253                 return false;
 254             }
 255
 256             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
 257             return inserter_type::call(sink, n_, p_) &&
 258                    karma::delimit_out(sink, d);    // always do post-delimiting
 259         }
 260
 261         // A double_(1.0) without any associated attribute just emits its
 262         // immediate literal
 263         template <typename OutputIterator, typename Context, typename Delimiter>
 264         bool generate(OutputIterator& sink, Context&, Delimiter const& d
 265           , unused_type) const
 266         {
 267             typedef real_inserter<T, Policies, CharEncoding, Tag> inserter_type;
 268             return inserter_type::call(sink, n_, p_) &&
 269                    karma::delimit_out(sink, d);    // always do post-delimiting
 270         }
 271
 272         template <typename Context>
 273         static info what(Context const& /*context*/)
 274         {
 275             return info("real");
 276         }
 277
 278         T n_;
 279         Policies p_;
 280     };
 281
 282     ///////////////////////////////////////////////////////////////////////////
 283     // Generator generators: make_xxx function (objects)
 284     ///////////////////////////////////////////////////////////////////////////
 285     namespace detail
 286     {
 287         template <typename T, typename Modifiers
 288           , typename Policies = real_policies<T> >
 289         struct make_real
 290         {
 291             static bool const lower =
 292                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
 293             static bool const upper =
 294                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
 295
 296             typedef any_real_generator<
 297                 T, Policies
 298               , typename spirit::detail::get_encoding_with_case<
 299                     Modifiers, unused_type, lower || upper>::type
 300               , typename detail::get_casetag<Modifiers, lower || upper>::type
 301             > result_type;
 302
 303             template <typename Terminal>
 304             result_type operator()(Terminal const& term, unused_type) const
 305             {
 306                 typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
 307                 using spirit::detail::get_stateful_data;
 308                 return result_type(get_stateful_data<tag_type>::call(term));
 309             }
 310         };
 311     }
 312
 313     template <typename Modifiers>
 314     struct make_primitive<tag::float_, Modifiers>
 315       : detail::make_real<float, Modifiers> {};
 316
 317     template <typename Modifiers>
 318     struct make_primitive<tag::double_, Modifiers>
 319       : detail::make_real<double, Modifiers> {};
 320
 321     template <typename Modifiers>
 322     struct make_primitive<tag::long_double, Modifiers>
 323       : detail::make_real<long double, Modifiers> {};
 324
 325     ///////////////////////////////////////////////////////////////////////////
 326     template <typename T, typename Policies, typename Modifiers>
 327     struct make_primitive<
 328             tag::stateful_tag<Policies, tag::double_, T>, Modifiers>
 329       : detail::make_real<typename remove_const<T>::type
 330           , Modifiers, Policies> {};
 331
 332     ///////////////////////////////////////////////////////////////////////////
 333     namespace detail
 334     {
 335         template <typename T, typename Modifiers
 336           , typename Policies = real_policies<T> >
 337         struct make_real_direct
 338         {
 339             static bool const lower =
 340                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
 341             static bool const upper =
 342                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
 343
 344             typedef literal_real_generator<
 345                 T, Policies
 346               , typename spirit::detail::get_encoding_with_case<
 347                     Modifiers, unused_type, lower || upper>::type
 348               , typename detail::get_casetag<Modifiers, lower || upper>::type
 349               , false
 350             > result_type;
 351
 352             template <typename Terminal>
 353             result_type operator()(Terminal const& term, unused_type) const
 354             {
 355                 typedef tag::stateful_tag<Policies, tag::double_, T> tag_type;
 356                 using spirit::detail::get_stateful_data;
 357                 return result_type(T(fusion::at_c<0>(term.args))
 358                   , get_stateful_data<tag_type>::call(term.term));
 359             }
 360         };
 361     }
 362
 363     template <typename Modifiers, typename A0>
 364     struct make_primitive<
 365         terminal_ex<tag::float_, fusion::vector1<A0> >, Modifiers>
 366       : detail::make_real_direct<float, Modifiers> {};
 367
 368     template <typename Modifiers, typename A0>
 369     struct make_primitive<
 370         terminal_ex<tag::double_, fusion::vector1<A0> >, Modifiers>
 371       : detail::make_real_direct<double, Modifiers> {};
 372
 373     template <typename Modifiers, typename A0>
 374     struct make_primitive<
 375         terminal_ex<tag::long_double, fusion::vector1<A0> >, Modifiers>
 376       : detail::make_real_direct<long double, Modifiers> {};
 377
 378     ///////////////////////////////////////////////////////////////////////////
 379     template <typename T, typename Policies, typename A0, typename Modifiers>
 380     struct make_primitive<
 381         terminal_ex<tag::stateful_tag<Policies, tag::double_, T>
 382           , fusion::vector1<A0> >
 383           , Modifiers>
 384       : detail::make_real_direct<typename remove_const<T>::type
 385           , Modifiers, Policies> {};
 386
 387     ///////////////////////////////////////////////////////////////////////////
 388     namespace detail
 389     {
 390         template <typename T, typename Modifiers>
 391         struct basic_real_literal
 392         {
 393             static bool const lower =
 394                 has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
 395             static bool const upper =
 396                 has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
 397
 398             typedef literal_real_generator<
 399                 T, real_policies<T>
 400               , typename spirit::detail::get_encoding_with_case<
 401                     Modifiers, unused_type, lower || upper>::type
 402               , typename detail::get_casetag<Modifiers, lower || upper>::type
 403               , true
 404             > result_type;
 405
 406             template <typename T_>
 407             result_type operator()(T_ i, unused_type) const
 408             {
 409                 return result_type(T(i));
 410             }
 411         };
 412     }
 413
 414     template <typename Modifiers>
 415     struct make_primitive<float, Modifiers>
 416       : detail::basic_real_literal<float, Modifiers> {};
 417
 418     template <typename Modifiers>
 419     struct make_primitive<double, Modifiers>
 420       : detail::basic_real_literal<double, Modifiers> {};
 421
 422     template <typename Modifiers>
 423     struct make_primitive<long double, Modifiers>
 424       : detail::basic_real_literal<long double, Modifiers> {};
 425
 426     // lit(double)
 427     template <typename Modifiers, typename A0>
 428     struct make_primitive<
 429             terminal_ex<tag::lit, fusion::vector1<A0> >
 430           , Modifiers
 431           , typename enable_if<traits::is_real<A0> >::type>
 432     {
 433         static bool const lower =
 434             has_modifier<Modifiers, tag::char_code_base<tag::lower> >::value;
 435         static bool const upper =
 436             has_modifier<Modifiers, tag::char_code_base<tag::upper> >::value;
 437
 438         typedef literal_real_generator<
 439             typename remove_const<A0>::type, real_policies<A0>
 440           , typename spirit::detail::get_encoding_with_case<
 441                 Modifiers, unused_type, lower || upper>::type
 442           , typename detail::get_casetag<Modifiers, lower || upper>::type
 443           , true
 444         > result_type;
 445
 446         template <typename Terminal>
 447         result_type operator()(Terminal const& term, unused_type) const
 448         {
 449             return result_type(fusion::at_c<0>(term.args));
 450         }
 451     };
 452 }}}
 453
 454 #endif // defined(BOOST_SPIRIT_KARMA_REAL_FEB_26_2007_0512PM)